Can I name two? Anthony (Dance to the Music of Time) Powell's little-known third novel, Agents and Patients, is hilarious: rogue Freudian screenwriter-adventurers Chipchase and Maltravers try to take dim, well-intentioned, wealthy Blore-Smith of everything he's got. Somebody get this book back into print!
But only humor of your own moment can touch you to the core. The funniest book I've read from the past ten less-than-hilarious years--both deeply moving and literally-laugh-out-loud-in-public funny--is Ed Park's Personal Days, an office dystopia fizzing with formal and verbal energy.